The presence of vitamin A in human tryptophan-rich prealbumin

Abstract
Human tryptophan-rich prealbumin was isolated from serum and its homogeneity evaluated by immunoelectrophoresis and polyacrylamide-gel electrophoresis. The green fluorescence of the protein when exposed to ultraviolet light was due to the presence of vitamin A. Tryptophan-rich prealbumin probably represents the hither-to unknown specific transport protein for vitamin A.